Non-rotating plug

Abstract

The plug set of the present invention comprises an upper plug having a non-rotation insert retained therein and a lower plug having longitudinal splines therein and a non-rotation insert on the bottom thereof.

Having thus described my invention, I claim: 
     
       1. An anti-rotation plug set comprising: an upper plug including: a body member having a cavity in the bottom thereof;   an elastomeric wiper covering disposed about a portion of the body member and retained thereon; and   an anti-rotation insert retained within the cavity in the bottom of the body member, the insert having a plurality of downwardly facing elongated projections thereon; and   a bottom plug including: a body member having a bore therethrough having, in turn, a plurality of longitudinal recesses in the upper portion thereof adapted to receive the downwardly facing elongated projections of the upper plug;   an elastomeric wiper covering disposed about a portion of the body member and retained thereon;   an diaphragm sealing the bore through the body member, the diaphragm located below the longitudinal recesses in the upper portion of the bore in the body member; and   a anti-rotation insert retained within the lower portion, the bore through the body member, the lower anti-rotation insert having a plurality of downwardly facing teeth thereon.       
     
     
       2. The combination of claim 1 wherein: the body member of the upper plug and the anti-rotation insert are formed of plastic.   
     
     
       3. The combination of claim 1 wherein: the body member of the lower plug and the anti-rotation insert are formed of plastic.   
     
     
       4. The combination of claim 1 wherein: the body member of the upper plug and the anti-rotation insert are formed of aluminum.   
     
     
       5. The combination of claim 1 wherein: the body member of the lower plug, and the anti-rotation insert are formed of aluminum.   
     
     
       6. The combination of claim 1 wherein: the anti-rotation insert of the upper plug and the anti-rotation insert of the lower plug are adhesively bonded to the respective body member of the upper plug and body member of the lower plug.   
     
     
       7. The combination of claim 1 wherein: the anti-rotation insert of the upper plug and the lower anti-rotation insert of the lower plug are threadedly engaged with the respective body member of the upper plug and body member of the lower plug.   
     
     
       8. The combination of claim 1 further comprising: a piece of floating equipment having a portion thereof adapted to engage the downwardly facing teeth on the anti-rotation insert of the lower plug of said anti-rotation plug set.   
     
     
       9. The combination of claim 8 wherein: the piece of floating equipment having a plurality of upwardly facing teeth therein to engage the downwardly facing teeth of the anti-rotation insert of the lower plug of said anti-rotation plug set.